SSM Millimeter-wave radar generates a narrower beam than conventional microwave radar, making it less vulnerable to antiradar missiles than conventional radar. (a) Calculate the angular width 2 θ of the central maximum, from first minimum to first minimum, produced by a 220 GHz radar beam emitted by a 55.0-cm-diameter circular antenna. (The frequency is chosen to coincide with a low-absorption atmospheric “window.”) (b) What is 2 θ for a more conventional circular antenna that has a diameter of 2.3 m and emits at wavelength 1.6 cm?
SSM Millimeter-wave radar generates a narrower beam than conventional microwave radar, making it less vulnerable to antiradar missiles than conventional radar. (a) Calculate the angular width 2 θ of the central maximum, from first minimum to first minimum, produced by a 220 GHz radar beam emitted by a 55.0-cm-diameter circular antenna. (The frequency is chosen to coincide with a low-absorption atmospheric “window.”) (b) What is 2 θ for a more conventional circular antenna that has a diameter of 2.3 m and emits at wavelength 1.6 cm?
SSM Millimeter-wave radar generates a narrower beam than conventional microwave radar, making it less vulnerable to antiradar missiles than conventional radar. (a) Calculate the angular width 2θ of the central maximum, from first minimum to first minimum, produced by a 220 GHz radar beam emitted by a 55.0-cm-diameter circular antenna. (The frequency is chosen to coincide with a low-absorption atmospheric “window.”) (b) What is 2θ for a more conventional circular antenna that has a diameter of 2.3 m and emits at wavelength 1.6 cm?
Large radio telescopes, like the one in Arecibo, Puerto Rico, can detect extremely weak signals. Suppose one radio telescope is sensitive enough to detect a signal which lays down only 1.4 pW of power on an area of 5.1 × 1015 m2. (a) What would be the total power that would be received by the antenna, assuming that its diameter is 310 m? (b) What would be the power of a source at 28000 ly distance from Earth that could provide such a signal? A light-year is the distance light travels in one year.
Both units in W
Large radio telescopes, like the one in Arecibo, Puerto Rico, can detect extremely weak signals. Suppose one radio telescope is
sensitive enough to detect a signal which lays down only 0.87 pW of power on an area of 6.8 x 10¹5 m². (a) What would be the total
power that would be received by the antenna, assuming that its diameter is 350 m? (b) What would be the power of a source at 26000
ly distance from Earth that could provide such a signal? A light-year is the distance light travels in one year.
(a) Number i
(b) Number
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(a) What would a small T.V. antenna suggest about the broadcast signal it is designed to receive?(b) A radio station in Sydney broadcasts at 9.67 MHz. What would be the length of its antenna if this is exactly half a wavelength long?
Chapter 36 Solutions
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